1. The problem is to convert 90 United States dollars (USD) to Canadian dollars (CAD) given the exchange rate CAD = 0.75 USD. 2. The formula to convert USD to CAD is: $$\text{CAD} = \frac{\text{USD}}{\text{Exchange Rate}}$$ where the exchange rate is the amount of USD per 1 CAD. 3. Given CAD = 0.75 USD, this means 1 CAD = 0.75 USD. 4. To find how many CAD correspond to 90 USD, divide 90 by 0.75: $$\text{CAD} = \frac{90}{0.75}$$ 5. Calculate the division: $$\text{CAD} = 120$$ 6. Therefore, 90 USD is equivalent to 120 CAD.